*{margin:0;padding:0;box-sizing:border-box;}:root{--primary-color:#6366f1;--primary-dark:#4f46e5;--secondary-color:hsl(258,90%,66%);--accent-color:#ec4899;--success-color:#10b981;--bg-color:#f8fafc;--card-bg:#ffffff;--text-color:#1e293b;--text-light:#64748b;--border-color:#e2e8f0;--error-color:#ef4444;--shadow:0 4px 6px -1px rgba(0,0,0,0.1),0 2px 4px -1px rgba(0,0,0,0.06);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.1),0 4px 6px -2px rgba(0,0,0,0.05);}body{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:var(--text-color);line-height:1.6;min-height:100vh;display:flex;flex-direction:column;}.back-btn{display:inline-flex;align-items:center;gap:0.5rem;padding:0.75rem 1.5rem;background:var(--card-bg);color:var(--primary-color);text-decoration:none;border-radius:12px;font-weight:600;font-size:1rem;box-shadow:var(--shadow);transition:all 0.3s ease;margin:4rem 2rem 2rem;position:relative;overflow:hidden;border:2px solid transparent;width:fit-content;}.back-btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(99,102,241,0.1),transparent);transition:left 0.5s ease;}.back-btn:hover::before{left:100%;}.back-btn:hover{background:var(--primary-color);color:white;transform:translateX(-5px);box-shadow:var(--shadow-lg);border-color:var(--primary-color);}.back-btn:active{transform:translateX(-3px)scale(0.98);}.container{max-width:900px;margin:0 auto;padding:1.5rem 1rem;width:100%;background:transparent;flex:1;}.page-header{text-align:center;margin-bottom:2rem;}.page-header h1{font-size:2rem;color:white;margin-bottom:0.5rem;text-shadow:0 2px 4px rgba(0,0,0,0.1);}.page-header p{font-size:1rem;color:rgba(255,255,255,0.9);line-height:1.5;}.calc-wrapper{background:var(--card-bg);border-radius:16px;box-shadow:var(--shadow-lg);padding:2rem 1.5rem;animation:fadeInUp 0.6s ease;}.calculator-section{margin-bottom:2rem;}.calculator{background:linear-gradient(135deg,#2d3748 0%,#1a202c 100%);border-radius:16px;padding:1.5rem;box-shadow:var(--shadow-lg);margin-bottom:2rem;}.display-section{background:linear-gradient(135deg,#1a202c 0%,#2d3748 100%);border-radius:12px;padding:1.5rem 1rem;margin-bottom:1.5rem;text-align:right;border:2px solid #4a5568;}.display-history{font-size:0.9rem;color:#a0aec0;min-height:1.5rem;margin-bottom:0.5rem;word-break:break-all;}.display-main{font-size:2rem;color:#f7fafc;font-weight:700;min-height:2.5rem;word-break:break-all;}.buttons-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0.75rem;}.buttons-grid button{padding:1.25rem;font-size:1.25rem;font-weight:600;border:none;border-radius:12px;cursor:pointer;transition:all 0.2s ease;box-shadow:var(--shadow);}.buttons-grid button:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}.buttons-grid button:active{transform:translateY(0)scale(0.98);}.btn-number{background:linear-gradient(135deg,#f7fafc 0%,#edf2f7 100%);color:var(--text-color);}.btn-number:hover{background:linear-gradient(135deg,#edf2f7 0%,#e2e8f0 100%);}.btn-zero{grid-column:span 2;}.btn-operator{background:linear-gradient(135deg,var(--primary-color)0%,var(--primary-dark)100%);color:white;}.btn-operator:hover{background:linear-gradient(135deg,var(--primary-dark)0%,#4338ca 100%);}.btn-function{background:linear-gradient(135deg,#f59e0b 0%,#d97706 100%);color:white;}.btn-function:hover{background:linear-gradient(135deg,#d97706 0%,#b45309 100%);}.btn-equals{background:linear-gradient(135deg,var(--success-color)0%,#059669 100%);color:white;}.btn-equals:hover{background:linear-gradient(135deg,#059669 0%,#047857 100%);}.scientific-toggle{margin-top:1.5rem;text-align:center;}.btn-toggle{padding:0.75rem 1.5rem;background:linear-gradient(135deg,var(--secondary-color)0%,#9333ea 100%);color:white;border:none;border-radius:8px;font-size:0.95rem;font-weight:600;cursor:pointer;transition:all 0.3s ease;box-shadow:var(--shadow);}.btn-toggle:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}.scientific-panel{margin-top:1.5rem;padding-top:1.5rem;border-top:2px solid #4a5568;animation:slideDown 0.3s ease;}.scientific-buttons{display:grid;grid-template-columns:repeat(5,1fr);gap:0.5rem;}.btn-scientific{padding:1rem;font-size:0.95rem;font-weight:600;background:linear-gradient(135deg,#8b5cf6 0%,#7c3aed 100%);color:white;border:none;border-radius:8px;cursor:pointer;transition:all 0.2s ease;box-shadow:var(--shadow);}.btn-scientific:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);background:linear-gradient(135deg,#7c3aed 0%,#6d28d9 100%);}.history-section{background:var(--bg-color);border-radius:12px;padding:1.5rem;border:1px solid var(--border-color);}.history-section h4{font-size:1.1rem;color:var(--text-color);margin-bottom:1rem;}.history-list{max-height:200px;overflow-y:auto;margin-bottom:1rem;}.history-list::-webkit-scrollbar{width:6px;}.history-list::-webkit-scrollbar-track{background:#f1f5f9;border-radius:10px;}.history-list::-webkit-scrollbar-thumb{background:var(--primary-color);border-radius:10px;}.history-empty{text-align:center;color:var(--text-light);font-size:0.9rem;padding:2rem 1rem;}.history-item{background:white;border:1px solid var(--border-color);border-radius:8px;padding:0.75rem 1rem;margin-bottom:0.5rem;font-size:0.9rem;color:var(--text-color);display:flex;justify-content:space-between;align-items:center;transition:all 0.2s ease;}.history-item:hover{border-color:var(--primary-color);box-shadow:var(--shadow);transform:translateX(5px);}.history-calculation{font-weight:600;}.history-result{color:var(--primary-color);font-weight:700;}.btn-clear-history{width:100%;padding:0.75rem;background:var(--error-color);color:white;border:none;border-radius:8px;font-size:0.9rem;font-weight:600;cursor:pointer;transition:all 0.3s ease;}.btn-clear-history:hover{background:#dc2626;transform:translateY(-2px);box-shadow:var(--shadow);}.info-section{background:linear-gradient(135deg,#f0f4ff 0%,#faf5ff 100%);border-left:4px solid var(--primary-color);border-radius:8px;padding:1.5rem;margin-bottom:2rem;animation:fadeIn 0.6s ease 0.6s backwards;}.info-section h3{font-size:1.1rem;color:var(--primary-color);margin-bottom:1rem;}.info-section ul{list-style:none;padding-left:0;}.info-section li{padding:0.5rem 0;padding-left:1.5rem;position:relative;font-size:0.95rem;color:var(--text-color);line-height:1.5;}.info-section li::before{content:'✓';position:absolute;left:0;color:var(--success-color);font-weight:bold;}.faq-section{background:var(--card-bg);border-radius:16px;padding:2rem;margin:2rem 0;box-shadow:var(--shadow-lg);}.faq-section h2{color:var(--primary-color);margin-bottom:1.5rem;font-size:1.5rem;text-align:center;}.faq-section > div{background:var(--bg-color);border-radius:12px;padding:1.5rem;margin-bottom:1rem;border-left:4px solid var(--primary-color);transition:all 0.3s ease;}.faq-section > div:hover{border-color:var(--primary-dark);box-shadow:var(--shadow);}.faq-section h3{font-size:1.1rem;color:var(--text-color);margin-bottom:0.75rem;font-weight:600;}.faq-section p{margin:0;color:var(--text-light);line-height:1.7;}.seo-article{background:var(--card-bg);border-radius:16px;padding:2rem;margin:2rem 0;box-shadow:var(--shadow-lg);}.seo-article h2{color:var(--primary-color);margin-bottom:1.5rem;font-size:1.5rem;}.seo-article p{margin-bottom:1.25rem;line-height:1.7;color:var(--text-color);}.seo-article strong{color:var(--primary-dark);font-weight:600;}.seo-article ul{margin:0 0 1.25rem 1.5rem;line-height:1.8;color:var(--text-color);}.features-section{margin-bottom:2rem;animation:fadeIn 0.6s ease 0.8s backwards;}.features-section h3{font-size:1.25rem;color:var(--text-color);margin-bottom:1.5rem;text-align:center;}.features-grid{display:grid;grid-template-columns:1fr;gap:1.25rem;}.feature-card{background:linear-gradient(135deg,#f8fafc 0%,#f1f5f9 100%);border:1px solid var(--border-color);border-radius:12px;padding:1.5rem;text-align:center;transition:all 0.3s ease;}.feature-card:hover{border-color:var(--primary-color);box-shadow:var(--shadow);transform:translateY(-4px);}.feature-icon{font-size:2.5rem;display:block;margin-bottom:1rem;}.feature-card h4{font-size:1.05rem;color:var(--text-color);margin-bottom:0.5rem;}.feature-card p{font-size:0.9rem;color:var(--text-light);line-height:1.5;}.pro-footer{background:linear-gradient(135deg,#1e293b 0%,#334155 100%);color:#e2e8f0;padding:3rem 1rem 1rem;margin-top:auto;}.footer-container{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1fr;gap:2rem;margin-bottom:2rem;}.footer-section h4{color:white;margin-bottom:1rem;font-size:1.25rem;}.footer-brand{text-align:center;}.footer-brand img{width:200px;height:auto;border-radius:12px;margin-bottom:1rem;margin-top:2rem;}.footer-section ul{list-style:none;}.footer-section ul li{margin-bottom:0.5rem;}.footer-section a{color:#cbd5e1;text-decoration:none;transition:color 0.3s ease;}.footer-section a:hover{color:var(--primary-color);}.contact p{margin-bottom:0.5rem;color:#cbd5e1;}.contact small{display:block;color:#94a3b8;font-size:0.8rem;margin-top:-0.25rem;margin-bottom:0.5rem;}.footer-bottom{border-top:1px solid #475569;padding-top:1.5rem;text-align:center;}.footer-bottom p{color:#94a3b8;font-size:0.9rem;margin-bottom:0.5rem;}.copyright-warning{font-size:0.8rem;color:#64748b;margin-top:0.5rem;}@media(min-width:640px){.calc-wrapper{padding:2.5rem 2rem;}.display-main{font-size:2.5rem;}.features-grid{grid-template-columns:1fr 1fr;}.footer-container{grid-template-columns:repeat(2,1fr);}.faq-section,.seo-article{padding:2.5rem;}}@media(min-width:768px){.container{padding:2rem 1.5rem;}.page-header h1{font-size:2.5rem;}.page-header p{font-size:1.1rem;}.calc-wrapper{padding:3rem;}.calculator{padding:2rem;}.display-main{font-size:3rem;}.buttons-grid button{padding:1.5rem;font-size:1.5rem;}.features-grid{grid-template-columns:repeat(4,1fr);}.feature-card{padding:2rem 1.5rem;}.footer-container{grid-template-columns:repeat(3,1fr);text-align:left;}.footer-brand{text-align:left;}}@media(min-width:1024px){.container{padding:2.5rem 2rem;}.page-header h1{font-size:3rem;}.calc-wrapper{padding:3.5rem;}}@media(max-width:768px){.faq-section,.seo-article{padding:1.5rem;}.faq-section h2,.seo-article h2{font-size:1.3rem;}.faq-section h3{font-size:1rem;}}@media(max-width:480px){.faq-section,.seo-article{padding:1.5rem;}.faq-section h2,.seo-article h2{font-size:1.25rem;}.faq-section h3{font-size:0.95rem;}.seo-article p{font-size:0.95rem;}}@keyframes fadeInUp{from{opacity:0;transform:translateY(30px);}to{opacity:1;transform:translateY(0);}}@keyframes fadeIn{from{opacity:0;}to{opacity:1;}}@keyframes slideDown{from{opacity:0;max-height:0;}to{opacity:1;max-height:500px;}}.feature-card{animation:fadeInUp 0.6s ease backwards;}.feature-card:nth-child(1){animation-delay:0.1s;}.feature-card:nth-child(2){animation-delay:0.2s;}.feature-card:nth-child(3){animation-delay:0.3s;}.feature-card:nth-child(4){animation-delay:0.4s;}*:focus{outline:2px solid var(--primary-color);outline-offset:2px;}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms !important;animation-iteration-count:1 !important;transition-duration:0.01ms !important;}}.ad-sidebar{width:100%;max-width:300px;margin:20px auto;text-align:center;border-radius:8px;}.blog-cta{background:linear-gradient(135deg,rgba(99,102,241,0.1)0%,rgba(139,92,246,0.1)100%);border:2px solid var(--primary-color);border-radius:12px;padding:2.5rem;text-align:center;}.blog-cta-content h3{font-size:1.8rem;color:var(--text-color);margin-bottom:1rem;font-weight:700;}.blog-cta-content p{font-size:1.1rem;color:var(--text-light);margin-bottom:1.5rem;line-height:1.8;}.blog-btn{display:inline-block;padding:1rem 2.5rem;background:linear-gradient(135deg,var(--primary-color)0%,var(--secondary-color)100%);color:white;text-decoration:none;border-radius:10px;font-weight:700;font-size:1.05rem;box-shadow:var(--shadow);transition:all 0.3s ease;}.blog-btn:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);}